CS3972 datasheet(2/8 Pages) ONSEMI

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Absolute Maximum Ratings

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input Voltage Range ........................................................................................................................................................3V to 60V

Output Switching Voltage.........................................................................................................................................................75V

Voltage Transient (tr=10µs, tf=400ms) ......................................................................................................................................60V

ESD (Human Body Model; R=1.5k

Ω, C=100pF) ...................................................................................................................2kV

Junction Temperature Range...............................................................................................................................-40°C to +150°C

Storage Temperature Range ................................................................................................................................-65°C to +150°C

Lead Temperature Soldering

Wave Solder (through hole styles only)......................................................................................10 sec. max, 260°C peak

Reflow (SMD styles only) ......................................................................................60 sec. max above 183°C, 230°C peak

Feedback Pin Voltage (1ms transient)...................................................................................................................................±15V

Electrical Characteristics: For 3V≤VCC≤60V, -40°C≤TA≤125°C unless otherwise specified.

Reference Voltage

VC=0.8V; VFB=VREF

1.214

1.244

1.274

Line Regulation

VC=0.8V; VFB=VREF, 3V≤VIN≤60V

0.03

%/V

Feedback Input Current

VC=0.8V; VFB=VREF

350

1100

Minimum Input Voltage

VC=VFB=VREF

2.6

3.0

Supply Current

VC=0.6V; 3V≤VIN≤60V

6.0

9.0

Supply Current Increase

during switch on time

VC=open, 1.0V≤VFB≤1.5V

mA/A

Switching Frequency

VC=VFB=VREF; VSW=15V

kHz

Maximum Duty Cycle

VC=2V; VFB=open, VSW=15V

VC Threshold

VFB=open; VSW =15V,

0.60

0.90

1.25

duty cycle=0%

s Error Amplifier

Transconductance

VC=0.8V; VFB=VREF, ∆IC=±25µA

2400

4400

7000

µmho

Source/Sink Current

VC=1.5V

120

200

400

µA

High Voltage Clamp

VFB=1.0V

2.0

Low Voltage Clamp

VFB=1.5V

0.38

Gain

0.9V

≤V

C≤1.4V, VFB=VREF

800

V/V

s Output Switch

Breakdown Voltage

VC=0.5V; 3V≤VIN≤60V, IOUT=5mA

On Resistance

VC=open, VFB=0.8V, IOUT=1.25A

0.6

1.0

Ω

Control Voltage to Switch

1.2V

≤V

C≤1.8V

A/V

Current Transconductance

Current Limit

Duty Cycle

≤50%, T

J≥25°C

1.25

3.00

Duty Cycle

≤50%, T

J<25°C

1.25

3.50

Duty Cycle=80%

1.00

2.50

Duty Cycle=80% (Note 1)

0.50

2.50

Note 1: 16 lead SO wide package only.

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